33" rider deck belt change

[BKBrown]

My 88 year old neighbor has a 7043844 33" RER and the deck (mower) belt has a big chunk missing (needs to be replaced).
I have the length and can get the belt, but want to know if there are any hints on the easiest way to replace that belt ????

This is a great guy and WII Vet, but he is constantly having something that I need to fix.


THANKS in advance !